Abstract
It is widely known that defrosting operation on commercial refrigerators is one of the main causes of inefficiency on these systems. Several defrosting methods are used nowadays, but the most commonly used are still time-controlled defrosting, usually by either electric resistive heating or reverse cycle, as most demand defrost methods are usually complex, expensive or unreliable. Demand defrost can work by either predicting frost formation by processing measured conditions (fin surface temperature, air humidity and air velocity) and/or frost accumulation symptoms such as pressure drop and refrigerant properties. Other way of knowing when to defrost is to directly measure the frost formation using sensors such as photoelectric, capacitive or resistive. This review gathers some of the methods that can be used for directly measuring frost accumulation on the evaporator fin surface.
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Acknowledgment
This work has been supported by the project Centro-01-0145-FEDER-000017 – EMaDeS – Energy, Materials and Sustainable Development, co-financed by the Portugal 2020 Program (PT 2020), within the Regional Operational Program of the Center (CENTRO 2020) and the European Union through the European Regional Development Fund (ERDF). The authors wish to thank the opportunity and financial support that permitted to carry on this project.
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de Aguiar, M.L., Gaspar, P.D., da Silva, P.D. (2019). Frost Measurement Sensors for Demand Defrost Control Systems: Purposed Applications in Evaporators. In: Ao, SI., Gelman, L., Kim, H. (eds) Transactions on Engineering Technologies. WCE 2018. Springer, Singapore. https://doi.org/10.1007/978-981-32-9531-5_12
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DOI: https://doi.org/10.1007/978-981-32-9531-5_12
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